About shipping rules

The shipping rules specified for a particular sales order define how the goods for the sales order should be shipped; whether they should be shipped only in full or partial shipments for the available quantities are allowed.
The shipment rules for a sales order are applied when you create a shipment for the order manually by using the Create shipment action in the Sales orders (SO301000) window, or automatically, by running the Create shipments process from the Process orders (SO501000) window.